Mitigation of DC Offset, Harmonic and Inter-harmonics in Grid-Connected Solar PV Systems Using CSOGI-EPLL

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Chinese explanation / 中文解读

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Original abstract

Abstract This paper presents a novel synchronization technique using a Cascaded Second-Order Generalized Integrator based Enhanced Phase-Locked Loop (CSOGI-EPLL) to improve power quality and reliability of single-phase grid-connected solar photovoltaic (GCSPV) systems. The primary objective is to mitigate the adverse effects of DC offset, harmonic and inter-harmonics which are common in grid environments and severely affect conventional PLL performance. The proposed CSOGI-EPLL structure offers superior dynamic behavior, enhances signal selectivity and provides robust filtering of unwanted components, enabling precise estimation of grid phase and frequency even under grid perturbances. The developed system is modeled on transfer function through mathematical equations and simulated in MATLAB to analyze stability of proposed PLL by putting damping factor (optimal selection), bode, polar & root locus plots. Simulation results clearly explained that the proposed method is notably better than other PLLs in terms of phase tracking accuracy, transient response and total harmonic distortion (THD) reduction. A total of nine scenarios of voltage sag/swell, DC offset, harmonic & inter-harmonics and phase shift observations proved that the proposed structure is an effective and reliable synchronization strategy.

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